Gangster Squad, a star-studded noir crime drama set in 1940s Los Angeles, opens in theaters today. The film is based on the true story of an undercover “Magnificent Seven“-style crew assembled by the LAPD to hunt down and kill celebrity mob king Mickey Cohen, who’s played by Sean Penn. A confidant of Bugsy Siegel, and a friend to everyone from Frank Sinatra to Richard Nixon, Cohen was a fixture on a then swanky Sunset Strip scene, home to now infamous nightclubs like Slapsy Maxie’s and Ciro’s that drew the likes of Ava Gardner, Humphrey Bogart, Cary Grant, and Marilyn Monroe. From the world-famous Coconut Grove night club in the since demolished Ambassador Hotel to Tony Duquette’s Latin American-themed interiors for The Mocambo featuring glass cages holding live cockatoos, pigeons, and parrots, click through to check out the haunts of the rich and the infamous in a time when gangsters ran our cities.